种群生物量的测定模型
（1）标准木的胸径
和高度
模型：
式中，n为每层中种群总株数；
，
分别为该层中第i株植物的胸径和高度。
（2）生物量W模型：
式中，a，b为待定系数；D，H分别为胸径和树高。
（3）净第一性生产力模型：
式中，
为总光合量；
为叶子的呼吸量；
，为其他器官的呼吸量；T为总光合量；S为总叶面积；W为呼吸器官干重；
为净光合作用速度；
为呼吸作用速度。
式中，
为叶室或呼吸装置内外气体
浓度差；V为叶室或呼吸装置内外气体流量；A为叶面积；gWD为呼吸器官的干重；T为大气压。
（4）光能利用效率模型：
式中，
为各层植物光合产量的效率系数（%）；
为群落总生产力的效率系数；18.5为克干物质的含能量；
为被吸收的光的有效辐射能。
参考文献
彭少麟，张祝平：鼎湖山阔叶混交林的第一性生产力研究。生态学报，1994，14（3）
Biological retention technology mainly through the matrix filtration, adsorption and microbial action to purify the infiltration of runoff rainwater. Because it can temporarily store the rain and then slowly into the surrounding soil, therefore, can play to reduce the surface rainwater peak flow, reduce runoff pollution and so on. Biological retention technology can include many forms, the more commonly used biological retention pool, concave green space, ecological grass ditch, plant buffer zone, rain garden and ecological wetlands. It can also include rainwater reuse facilities, soil improvement and so on.
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